Quantum control of a single-spin quantum emitter in diamond via coupling with a mechanical oscillator

• Speaker: Lee, Donghun (Korea Univ., Korea)

There has been rapidly growing interest in hybrid quantum devices involving a solid-state spin and a macroscopic mechanical oscillator. Such hybrid devices create exciting opportunities to mediate interactions between disparate qubits and to explore the quantum regime of macroscopic mechanical objects. In particular, a system consisting of the nitrogen-vacancy defect center in diamond embedded inside a high quality factor diamond mechanical oscillator is an appealing candidate for such a hybrid quantum device, as it combines the highly coherent and versatile spin properties of the defect center with the excellent mechanical properties of diamond resonators. In this talk, we will present recent experimental progress on diamond-based hybrid quantum devices in which the defect’s spin and orbital dynamics are mechanically driven by the motion of a mechanical oscillator. We will discuss the potential usage of multiple mechanical modes to fully engineer the strain environment of the defect center. For instance, simultaneous motion of flexural and torsional modes in T-shaped diamond cantilever can provide selective controls of linear and shear strain terms. We will also discuss future prospective applications, including strain-assisted indistinguishable photon generation, long range, phonon-mediated spin-spin interactions and phonon cooling and lasing in the quantum regime.